indoin definition

  • noun:
    • A substance resembling indigo-blue, obtained artificially from specific isatogen compounds.
    • A substance resembling indigo blue, obtained artificially from certain isatogen compounds.
    • A blue flocculent precipitate obtained when propiolic acid in sulphuric-acid option would be addressed with reducing agents eg metallic metal, zinc, or copper. It varies from indigo in not easily producing a sulphonic acid on heating.
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